Don't log in deactivated users.

lib/pleroma/plugs/authentication_plug.ex

@@ -12,6 +12,7 @@ def call(%{assigns: %{user: %User{}}} = conn, _), do: conn
   def call(conn, opts) do
     with {:ok, username, password} <- decode_header(conn),
          {:ok, user} <- opts[:fetcher].(username),
+         false <- !!user.info["deactivated"],
          saved_user_id <- get_session(conn, :user_id),
          {:ok, verified_user} <- verify(user, password, saved_user_id)
     do

lib/pleroma/plugs/oauth_plug.ex

@@ -16,7 +16,8 @@ def call(conn, _) do
             end
     with token when not is_nil(token) <- token,
          %Token{user_id: user_id} <- Repo.get_by(Token, token: token),
-         %User{} = user <- Repo.get(User, user_id) do
+         %User{} = user <- Repo.get(User, user_id),
+         false <- !!user.info["deactivated"] do
       conn
       |> assign(:user, user)
     else

test/plugs/authentication_plug_test.exs

@@ -14,6 +14,13 @@ defp fetch_nil(_name) do
     password_hash: Comeonin.Pbkdf2.hashpwsalt("guy")
   }
 
+  @deactivated %User{
+    id: 1,
+    name: "dude",
+    password_hash: Comeonin.Pbkdf2.hashpwsalt("guy"),
+    info: %{"deactivated" => true}
+  }
+
   @session_opts [
     store: :cookie,
     key: "_test",
@@ -131,6 +138,26 @@ test "it assigns the user", %{conn: conn} do
     end
   end
 
+  describe "with a correct authorization header for an deactiviated user" do
+    test "it halts the appication", %{conn: conn} do
+      opts = %{
+        optional: false,
+        fetcher: fn _ -> @deactivated end
+      }
+
+      header = basic_auth_enc("dude", "guy")
+
+      conn = conn
+        |> Plug.Session.call(Plug.Session.init(@session_opts))
+        |> fetch_session
+        |> put_req_header("authorization", header)
+        |> AuthenticationPlug.call(opts)
+
+      assert conn.status == 403
+      assert conn.halted == true
+    end
+  end
+
   describe "with a user_id in the session for an existing user" do
     test "it assigns the user", %{conn: conn} do
       opts = %{